package thread;

/**
 * StringBuilder
 * StringBuffer
 */
public class SyncApiDemo1 {
    public static void main(String[] args) {
        StringBuffer sb=new StringBuffer();
//        StringBuilder sb=new StringBuilder();
        Thread t1=new Thread(){
            public void run(){
                for (int i=0 ;i<1000;i++){
                    sb.append("hello");
                }
            }
        };
        Thread t2=new Thread(){
            public void run(){
                for (int i=0 ;i<1000;i++){
                    sb.append("world");
                }
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(sb.length());

    }
}
